If you want to make the “end game” materials, like Cronite and Oghmium, you have to go to Gaul’kor. This is by design, as that lawless northern city is supposed to be the most contested and dangerous place on the map. Thats why Tephra is also there.To my knowledge, the only blast furnace is in Gaul'kor, and the attractor can only be found in Tindrem, Morin Khur and Gaul'kor.
There do not appear to be guild versions of these appliances.